For a short time on Tuesday, internet traffic sent between Facebook and subscribers to AT&T's internet service passed through hardware belonging to the state-owned China Telecom before reaching its final destination, a security researcher said.

An innocent routing error is the most likely explanation for the highly circuitous route, but it's troubling nonetheless, said Barrett Lyon, the independent researcher who helped discover the anomaly and later blogged about it.

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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump